Fórmula 2

[\begin{matrix} F_{i} \\ F_{i + 1} \end{matrix}] = \underset{K_{g}}{\underset{⏟}{\frac{N_{i}}{h_{i}} [\begin{array}{rc} 1.0 & - 1.0 \\ - 1.0 & 1.0 \end{array}]}} [\begin{matrix} u_{i} \\ u_{i + 1} \end{matrix}]

;